ASME B5.60 pdf download WORKHOLDING CHUCKS: JAW TYPE CHUCKS Incorporating ASME B5.60.1 and ASME B5.60.4
This American National Standard establishes techni-cal requirements for workholding chucks used primarilyin turning operations.It covers jaw type chucks whethermanual or power-operated.
This Part of the ASME B5.60 standard covers theGeneral Description and Definitions of Terms relatedto jaw type workholding chucks.
3 TYPES OF JAw CHucKs BY DESIGN
self-centering chuck:a chuck in which all jaws moveto or away from the workpiece and maintain onecommon center.
compensating chuck:a chuck in which jaw(s) moveto or away from the workpiece withoutaltering theposition of the workpiece.
independent chuck:a chuck in which each individualworkholding jaw is moved to or from the workpiecewithout disturbing the position of any other jaw.An example of a power chuck assembly is presentedin Fig. 1.
4 METHODs OF ACTUATION
manual: a chuck that is actuated by hand with theaid of human energy (e.g.，by means of a chuckwrench). Refer to Fig. 2. power:a chuck that is actuated by means of pneumatic,hydraulic，or electrical energy，etc. Refer to Fig. 3.
aciua1or:a component within a chuck’s body，usedto operate the chuck’s mechanism,such as a wedge,lever，scroll，etc.base jaw:see master jaw.
centrifugal force: force generated by rotation thattends to move all parts away radially from the axisof rotation of the chuck.
chuck adapter:interface between the machine and thechuck. It can be a separate component or integral tochuck body.
chuck body: that part of the chuck that contains theactuator and master jaws.
clamping cylinder:device that actuates the chuckthrough a draw bar or draw tube with the aid ofpneumatic or hydraulic energy.
clamping force:algebraic sum of the individual radialforces applied by the top jaws on the workpiece.clamping iorque:product of the clamping force,clamping radius,and the coefficient of friction betweenthe top jaw(s) and the workpiece.
countercentrifugal chuck:a chuck in which there isa system that permits compensation for the loss ofclamping force due to centrifugal force.
draw bar:a bar or tube that connects the clampingcylinder to the chuck’s actuator to transmit the inputforce to the chuck.
dynamic clamping force:actual clamping force whenthe chuck is rotating.
hysteresis:change in static clamping force after thechuck has been rotated at working rotational speedwith a constant input force.
indicating band:a diameter on the chuck body desig-nated for measuring runout of a chuck.
input force: force acting on the chuck’s actuator,applied from an external energy source.
input torque:torque acting on the chuck’s actuator,applied from an external energy source.
master jaw:radial moving part within the chuck bodyto which the top jaw is mounted.
maximun rotational speed: maximum rotationalspeed in RPM specified by the manufacturer for a